One light-hour is the distance that light travels in an hour. How far is this, in kilometers? (Recall that the speed of light is 300,000 km/s.)
A) 1.08 billion km
B) 18 million km
C) 100 million km
D) 300,000 km
E) 9.46 trillion km
A
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A proton is accelerated from rest through a potential difference of 2.5 kV and then moves perpendicularly through a uniform 0.60-T magnetic field. What is the radius of the resulting path?
A. 15 mm B. 12 mm C. 18 mm D. 24 mm E. 8.5 mm
6.02 × 10^23 is known as ______________
Fill in the blank(s) with correct word
Asian astronomers ________.
A. devised ways to predict eclipses B. recorded the existence of sunspots C. kept detailed records of unusual celestial events D. All of these choices are correct.
Stellar parallax provides concrete proof that the
A) Earth rotates on its axis B) Earth is roughly spherical C) Earth moves around the Sun D) Moon moves around the Earth